岡本 光師¹, 森下 和彦¹, 坪倉 篤雄¹, 橋本 正樹², 山形 東吾², 森近 直子², 本藤 達也², 河越 卓司², 土岡 由紀子², 松浦 秀夫², 梶山 梧朗²

Mitsunori OKAMOTO¹, Kazuhiko MORISHITA¹, Tokuo TSUBOKURA¹, Masaki HASHIMOTO², Togo YAMAGATA², Naoko MORICHIKA², Tatsuya HONDO², Takuji KAWAGOE², Yukiko TSUCHIOKA², Hideo MATSUURA², Goro KAJIYAMA²

¹広島大学医学部臨床検査医学, ²広島大学医学部第一内科

¹The Department of Clinical Pathology , Hiroshima University, ²The First Department of Internal Medicine, Hiroshima University

キーワード : Continuous Wave Doppler, Cardiac Monitor, Doppler echocardiography, Hemodynamics

A continuous wave Doppler transducer for cardiac monitoring has been newly developed. The transducer with an ultrasonic carrier frequency of 2.5 MHz is horse-shoe in shape, 15 g (86 g when including the cord) in weight and 17×20×40 mm in size. A circular plate made of polyurethan-gel was used for angulation of the transducer. The transducer was fixed with a rubber band on the anterior chest wall. The Doppler signal was analyzed with a commercially available ultrasound Doppler system (Toshiba SSH-65A). The mitral and ejection flow patterns were obtained in the supine and standing positions, and before and after exercise in the standing position. The peak velocities of ejection flow and the rapid filling phase in the mitral flow could be recorded in the supine and standing positions and they increased after exercise. Thus, the transducer may provide a new cardiac monitoring method.